Siemens LMV 5 Series, Technical Instructions, Page: 209 / 374

LMV Series Technical Instructions
Document No. LV5 ‐ 1000
SCC Inc. Page 1 Section 7
7 ‐ 1: Troubleshooting Introduction
The LMV5 has an extensive list of fault codes to help clarify the nature of any fault. Section 7 ‐ 3
describes what every fault code is and gives some guidance on how to correct it.
The most common issues seen on the LMV5 are described in greater detail in Section 7 ‐ 2 to
offer additional troubleshooting help. The issues covered in Section 7 ‐ 2 are:
General
CANbus Faults Including “ AZL not on Bus ” and “ System Test ” ....................................................... 2
Fault Positioning Actuator – Error Code 15 .................................................................................... 6
Internal Fault Actuator – Error Code 19 ......................................................................................... 7
Flame Failure – Error Code 25 or 26 ............................................................................................... 8
Open Circuit / Short Circuit Sensor Faults – Error Code A6 (Diagnostics 50…5A) .......................... 9
Open Safety Loop – Error Code 21 ............................................................................................... 10
LMV5 Will Not Start (Stays in Phase 12) ....................................................................................... 11
LMV5 Will Not Modulate Properly ............................................................................................... 12
O2 Trim
O
2
Sensor is Not Reading .............................................................................................................. 13
O
2
Sensor Reading Grossly High or Low ........................................................................................ 14
O
2
Sensor Reads But Responds Very Slowly ................................................................................. 14
Ambient or Stack Temperature Sensor Reading Incorrectly ........................................................ 15
AZL says “ O2 Module not active or not Available ” ....................................................................... 15
AZL Says “ O2 Setpoint must lie 0.1% below O2 Ratio Control” or “O2 Setpoint must lie 0.1%
above O2 Min ” ........................................................................................................................ 16
AZL Says “ Measurement not Successful ” When Measuring the Delay Time for O
2
Trim ............. 17
AZL Says “ O2 Trim Control Automatically Deactivated ” ............................................................... 18
Variable Speed Drive (VSD)
VSD Will Not Operate.................................................................................................................... 19
Unsuccessful VSD Standardization ............................................................................................... 20
AZL Says “ Fan Speed Not Reached ” or “ Control Range Limitation VSD Module ” ........................ 22
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